R devel - May 2023 - is(x,"ANY") is FALSE

I?m somewhat puzzled by the following bit of code on R 4.2.3 (also R 4.2.2)
> df <- data.frame(x=1:3)
> is (df,"ANY")
[1] FALSE

This seem to be false when the first argument is any S3 class, while I would
think that ?ANY? would be true for S3, S4 and reference classes, as well as
primitive types.

This also seems to be a regression, as code that was previously working no
longer works.


A little more context on my use.

I?m defining a slot for a reference class using a type union, 
setClass(?MongoDB?,c(?NULL?,?ANY?))

[I should be using setOldClass(?mongo?) here, but I was having trouble promoting
the S3 ?mongo? class I was getting from the library.]

Then when I try to set the corresopnding slot I?m getting an error, because
?mongo? is not of type MongoDB (even through that is a class union which
contains ?ANY?).

I can work around the problem by setting the slot to type ?ANY?, but then I
loose the documentation that the intention is that it should a mongo database
connection.

Did I miss something here?  Or is this an unintended consequence of some other
change?

Thanks,
  ?Russell Almond




	[[alternative HTML version deleted]]

Hi,

This does seem to be a bug in is(); I'll take a look. I'm curious
about what stopped you from using setOldClass(), since that seems to
be the most appropriate solution.

Michael

On Tue, May 2, 2023 at 2:59?PM Russell Almond <russell at ralmond.net>
wrote:
>
> I?m somewhat puzzled by the following bit of code on R 4.2.3 (also R 4.2.2)
>
> > df <- data.frame(x=1:3)
> > is (df,"ANY")
> [1] FALSE
>
> This seem to be false when the first argument is any S3 class, while I
would think that ?ANY? would be true for S3, S4 and reference classes, as well
as primitive types.
>
> This also seems to be a regression, as code that was previously working no
longer works.
>
>
> A little more context on my use.
>
> I?m defining a slot for a reference class using a type union,
> setClass(?MongoDB?,c(?NULL?,?ANY?))
>
> [I should be using setOldClass(?mongo?) here, but I was having trouble
promoting the S3 ?mongo? class I was getting from the library.]
>
> Then when I try to set the corresopnding slot I?m getting an error, because
?mongo? is not of type MongoDB (even through that is a class union which
contains ?ANY?).
>
> I can work around the problem by setting the slot to type ?ANY?, but then I
loose the documentation that the intention is that it should a mongo database
connection.
>
> Did I miss something here?  Or is this an unintended consequence of some
other change?
>
> Thanks,
>   ?Russell Almond
>
>
>
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel


-- 
Michael Lawrence
Senior Principal Scientist, Director of Data Science and Statistical Computing
Genentech, A Member of the Roche Group
Office +1 (650) 225-7760
michafla at gene.com

Join Genentech on LinkedIn | Twitter | Facebook | Instagram | YouTube